وَإِذَا لَمْ تَأْتِهِم بِآيَةٍ قَالُواْ لَوْلاَ اجْتَبَيْتَهَا قُلْ إِنَّمَا أَتَّبِعُ مَا يِوحَى إِلَيَّ مِن رَّبِّي هَذَا بَصَآئِرُ مِن رَّبِّكُمْ وَهُدًى وَرَحْمَةٌ لِّقَوْمٍ يُؤْمِنُونَ
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سورة الأعراف
(7/203) And whenever thou bringest not unto them, as a sign, they say: wherefore hast not thou selected it? Say thou: I only follow that which hath been revealed unto me by my Lord. This is an enlightenment from your Lord and a guidance and a mercy unto a people who believe.
Surah Al-A'raf